Step 1: search on any unlocked available search engine with this term “free public proxy server ip”, you will be looking for a website that lists public proxy server ip, for example: http://www.cool-proxy.net/proxies/http_proxy_list (choose the highest download speed) copy IP Address and Port

Step 2: Click Options -> Options

Step 3: Click Advanced -> Network -> settings

and finally Step 4: paste IP Address and Port that you copied at step 1